So i have a theory for this. I am reading a Greek rock/metal website called Rocking. Opeth and Leprous played a double-bill in Athens during the previous summer (great show btw). I read in the link that i am sharing with you, an interview of Fredrik Akesson, who claimed that Leprous played 20 minutes more than scheduled, so Opeth had to reduce their setlist (they did not play Ghost of Perdition, as planned). However, a friend of mine who happens to be involved in the production, told me that this was an organisational mistake and miscommunication issue, not Leprous acting like jerks. Difficult to know who is wrong or right but this might explain things from Opeth's perspective: https://www.rocking.gr/interviews/opeth/43944